Distributed cooperative control for power sharing of DC distribution network with event-triggered communication mechanism

This paper develops an effective distributed cooperative control approach with an event-triggered communication mechanism (ETCM) for the active DC distribution network (DDN) system. Its control objective is to address the issues of voltage synchronization and power sharing among distributed renewable energy (DRE) while minimizing the utilization of communication resources. Firstly, a distribution network system model based on DC-DC converters (DDCs) is established, and each DRE is regarded as a heterogeneous multi-agent system (HMAS). Then, the distributed cooperative control problem of DREs is transformed into a cooperative output regulation (COR) problem with HMASs, which serves as an important foundation for controller strategy design. Secondly, considering different load demands in DDN system and the voltage of DC bus may deviate from its nominal value. Meanwhile, with the purpose of the proportional power sharing among DREs, this work proposes a distributed cooperative control approach under undirected communication topology, and designs a distributed observer based on dynamic ETCM while excluding Zeno behavior. In addition, the proposed control method can converge with a relatively fast speed, which improves the dynamic performance of the DDN system. Compared with the continuous time feedback control in DDN system, the proposed approach only needs the information of DRE itself and its neighboring DREs to accomplish the control objective, which further decreases the utilization of communication resources and reduces the update frequency of the controllers and switching loss of the DDCs. Finally, different simulation and experimental results are carried out to show the effectiveness of the proposed approach.